关键词: 花岗岩, 高温循环, 物理性质, 渗透率, 微观结构

Abstract: To investigate the effects of high-temperature cycles on the internal structure of rock, this study conducted permeability tests on granite under different temperature cycling conditions. The variations in porosity and permeability of rock samples after different thermal cycling treatments were analyzed, and the correlations between P-wave velocity and porosity as well as permeability were established through regression analysis. The results show that: 1)During 1-3 thermal cycles, both the porosity and permeability of granite decrease, following a logarithmic relationship. As the number of cycles increases to 5-10, the rate of reduction gradually slows down. This characteristic provides favorable conditions for the long-term development of deep geothermal resources. 2)Under different temperature cycling conditions, the P-wave velocity of granite exhibits a logarithmic correlation with both permeability- 引用格式:张玲,彭芯钰,章瑞环,等.基于Winkler地基梁理论的拼宽公路新老路基差异沉降分析［J］.河北大学学报(自然科学版),2026,46(1):1-12.引用格式:余莉,赵琨,周杰,等.不同温度循环作用下花岗岩的渗透性［J］.河北大学学报(自然科学版),2026,46(1):13-21.DOI:10.3969/j.issn.1000-1565.2026.01.002不同温度循环作用下花岗岩的渗透性余莉¹,赵琨¹,周杰¹,李沐宸¹,李皓楠²(1.河北大学 建筑工程学院,河北 保定 071002;2.中国矿业大学 力学与土木工程学院,北京 100083)摘 要:为探究高温循环对岩石内部结构的影响,本文开展了不同温度循环作用下花岗岩的渗透性实验,分析了经历不同温度循环处理后岩样孔隙率与渗透率的变化规律,并通过回归分析建立了纵波波速与孔隙率、渗透率之间的关系.结果表明:1)在1~3 次热循环中,花岗岩孔隙率与渗透率均有所降低,且变化服从对数关系;随着循环增加至5~10 次,二者下降速率逐渐减缓,该特征为深部地热资源的长期开发提供了有利条件.2)不同温度循环下,花岗岩纵波波速与渗透率、孔隙率均呈现对数关系.随循环次数增加,三者关系由 1~3 次循环时的对数关系逐渐转变为 5~10 次循环时的线性关系.因此,可通过测量纵波波速来无损估算花岗岩的孔隙率与渗透率.3)对 400 ℃ 热循环10次后的花岗岩进行 CT 扫描与 SEM 电镜观测发现,孔隙结构中出现碎屑颗粒,表明温度循环作用导致岩石内部结构损伤.该现象揭示了深部地热能开采过程中岩石物理性质劣化的机制,为深部地热资源开发提供了理论依据.关键词:花岗岩;高温循环;物理性质;渗透率;微观结构中图分类号:TU43 文献标志码:A 文章编号:1000-1565(2026)01-0013-09DOI:10.3969/j.issn.1000-1565.2026.01.002Permeability of granite under different temperature cyclesYU Li¹,ZHAO Kun¹,ZHOU Jie¹,LI Muchen¹,LI Haonan²(1.College of Civil Engineering and Architecture, Hebei University, Baoding 071002, China;2.School of Mechanics and Civil Engineering,China University of Mining and Technology,Beijing 100083,China)Abstract: To investigate the effects of high-temperature cycles on the internal structure of rock, this study conducted permeability tests on granite under different temperature cycling conditions. The variations in porosity and permeability of rock samples after different thermal cycling treatments were analyzed, and the correlations between P-wave velocity and porosity as well as permeability were established through regression analysis. The results show that: 1)During 1-3 thermal cycles, both the porosity and permeability of granite decrease, following a logarithmic relationship. As the number of cycles increases to 5-10, the rate of reduction gradually slows down. This characteristic provides favorable conditions for the long-term development of deep geothermal resources. 2)Under different temperature cycling conditions, the P-wave velocity of granite exhibits a logarithmic correlation with both permeability- 收稿日期:2025-04-28;修回日期:2025-11-06 基金项目:河北省科技厅面上项目(E2023201024) 第一作者:余莉(1985—),女,河北大学副教授,博士,主要从事岩土体渗流与地灾监测方向研究.E-mail:964630415@qq.com 通信作者:赵琨(2001—),男,河北大学硕士研究生,主要从事岩石渗流方向研究.E-mail:2798833802@qq.com 第1期余莉等:不同温度循环作用下花岗岩的渗透性河北大学学报(自然科学版) 第46卷and porosity. With increasing cycle numbers, the relationship among the three shifts from logarithmic during 1-3 cycles to linear during 5-10 cycles. Therefore, the porosity and permeability of granite can be estimated non-destructively by measuring the P-wave velocity. 3)CT scanning and SEM observations of granite subjected to 10 thermal cycles at 400 ℃ reveal the presence of debris particles within the pore structure, indicating that temperature cycling causes damage to the internal structure of the rock. This phenomenon elucidates the mechanism behind the deterioration of rock physical properties during deep geothermal energy extraction and provides a theoretical basis for the development of deep geothermal resources.

Key words: granite, high temperature cycling, physical properties, permeability, microstructure